Efficient methanol desorption in shear instability

Jorma Harju, Jaime E. Pineda, Anton I. Vasyunin, Paola Caselli, Stella S.R. Offner, Alyssa A. Goodman, Mika Juvela, Olli Sipilä, Alexandre Faure, Romane Le Gal, Pierre Hily-Blant, João Alves, Luca Bizzocchi, Andreas Burkert, Hope Chen, Rachel K. Friesen, Rolf Güsten, Philip C. Myers, Anna Punanova, Claire RistErik Rosolowsky, Stephan Schlemmer, Yancy Shirley, Silvia Spezzano, Charlotte Vastel, Laurent Wiesenfield

Research output: Contribution to journalArticlepeer-review

Abstract

We present ALMA maps of the starless molecular cloud core Ophiuchus/H-MM1 in the lines of deuterated ammonia (ortho-NH2D), methanol (CH3OH), and sulphur monoxide (SO). While the dense core is outlined by NH2D emission, the CH3OH and SO distributions form a halo surrounding the core. Because methanol is formed on grain surfaces, its emission highlights regions where desorption from grains is particularly efficient. Methanol and sulphur monoxide are most abundant in a narrow zone that follows one side of the core. The region of the brightest emission has a wavy structure that rolls up at one end. This is the signature of Kelvin-Helmholtz instability occurring in sheared flows. We suggest that in this zone, methanol and sulphur are released as a result of grain-grain collisions induced by shear vorticity.

Original languageEnglish (US)
JournalUnknown Journal
StatePublished - Mar 27 2019

Keywords

  • Astrochemistry
  • ISM: individual(Ophiuchus/H-MM1)
  • ISM: kinematics and dynamics
  • ISM: molecules

ASJC Scopus subject areas

  • General

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